<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="login_avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- ref能够取到对象实例 -->
      <!-- this.$refs[loginFormRef]即可取到这个对象的实例 -->
      <el-form
        ref="loginFormRef"
        :rules="loginFormRules"
        :model="loginForm"
        class="login_forms"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user-solid"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="el-icon-lock"
            v-model="loginForm.password"
            show-password
          ></el-input>
        </el-form-item>
        <el-form-item class="login_btns">
          <!-- 登录按钮 -->
          <el-button type="primary" @click="loginVali">登录</el-button>
          <!-- 重置按钮 -->
          <el-button type="info" @click="resetForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 数据绑定对象
      loginForm: {
        username: '',
        password: ''
      },
      // 表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 5, max: 10, message: '长度在 5 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 5, max: 10, message: '长度在 5 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 登陆前的预验证
    loginVali () {
      this.$refs.loginFormRef.validate(async vali => {
        if (!vali) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status === 200) {
          this.$message({
            message: '登录成功',
            type: 'success'
          })
        } else {
          this.$message({
            message: '登录失败',
            type: 'error'
          })
        }
        window.sessionStorage.setItem('token', res.data.token)
        // 编程式导航
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang='less' scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  position: relative;
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 10px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .login_avatar_box {
      width: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      position: absolute;
      left: 50%;
      top: -25%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      transform: translate(-50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .login_btns {
      display: flex;
      justify-content: flex-end;
    }
    .login_forms {
      position: absolute;
      bottom: 0;
      width: 100%;
      box-sizing: border-box;
      padding: 10px;
    }
  }
}
</style>
